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  • SQL - Add up all row-values of one column in a singletable

    - by ThE_-_BliZZarD
    Hello Everybody, I've got a question regarding a SQL-select-query: The table contains several columns, one of which is an Integer-column called "size" - the task I'm trying to perform is query the table for the sum of all rows (their values), or to be more exact get a artifical column in my ResultSet called "overallSize" which contains the sum of all "size"-values in the table. Preferable it would be possible to use a WHERE-clause to add only certain values ("WHERE bla = 5" or something similar). The DB-engine is HSQLDB (HyperSQL), which is compliant to SQL2008. Thank you in advance :)

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  • Date difference in SQL Server 2005

    - by naveen
    Hi, I have two dates of the form Start Date: 2007-03-24, End Date: 2009-06-26 Now I need to find the difference between these two in the below form: 2 years, 3 months and 2 days Can someone please … in SQL Server 2005

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  • Signs that a SQL statement is dangerous

    - by Matt
    Hi, I want to develop a function in PHP that checks how dangerous a SQL statement is. When i say dangerous i mean, certain symbols, characters or strings that are used to get data from a database that the user shouldnt see. For example: SELECT * FROM users WHERE userId = '1' can be injected in several ways. Although i clean the params, i also want to monitor how safe the query is to run. Thanks in advance

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  • LINQ display row numbers

    - by timvaines
    I simply want to include a row number against the returned results of my query. I found the following post that describes what I am trying to achieve but gives me an exception http://vaultofthoughts.net/LINQRowNumberColumn.aspx "An expression tree may not contain an assignment operator" In MS SQL I would just use the ROWNUMBER() function, I'm simply looking for the equivalent in LINQ.

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  • MDF and LDF Files size

    - by Nazim
    I was wondering if there was any recommended max size for MDF and/or LDF Files for an SQL server instance. For example, if I want to create a 400 GBytes Database, is there a rule to help me decide how many mdf files I should create ? or should I just go ahead and create a single gigantic 400Gbytes mdf file? If so is this going to somehow affect the database performances ?

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  • SQL Server Redirection

    - by MrTehee
    We are switching from a SQL cluster to a mirrored solution. The problem is that we have a bunch of programs that would have to switch connection strings to handle the failover. Is there any way the we can set up a redirect or proxy that would take any legacy requests and forward them to the mirrored solution?

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  • Find query that caused update

    - by MadMax
    We have been having problems with ghost updates in our DB (SQL Server 2005) fields are changeing and we cannot find the routine that is updating. Is there a way using an update trigger (Or any other way) to tell what caused the update?

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  • SQL updating a column in a table

    - by tecnodude
    Hi, I have the following table in an access database id VisitNo Weight 1 1 100 1 2 95 1 3 96 1 4 94 1 5 93 Now row 2 and 4 are deleted. So i have... id VisitNo Weight 1 1 100 1 3 96 1 5 93 However what i need is... id VisitNo Weight 1 1 100 1 2 96 1 3 93 What is the SQL query i need to accomplish the above? thanks

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  • sql count() query for tables

    - by air
    i have two tables table1 fields fid,fname,fage a ,abc ,20 b ,bcv ,21 c ,cyx ,19 table2 fields rcno,fid,status 1 ,a ,ok 2 ,c ,ok 3 ,a ,ok 4 ,b ,ok 5 ,a ,ok i want to display rectors like this fid from table1 , count(recno) from table 2 and fage from table1 fid,count(recno),fage a ,3 ,20 b ,2 ,21 c ,1 ,19 i try many sql queries but got error Thanks

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  • Is there anyway that we can get a label value to a Sql

    - by Pradeep
    SELECT COUNT(*) AS Expr1 FROM Book INNER JOIN Temp_Order ON Book.Book_ID = Temp_Order.Book_ID WHERE (Temp_Order.User_ID = 25) AND (CONVERT (nvarchar, Temp_Order.OrderDate, 111) = CONVERT (nvarchar, GETDATE(), 111)) In here i want to change my User_ID to get from a label.Text this Sql Statement is in a DataView. so in the Wizard it not accepting a text box values or anything. can someone please help me to solve this

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  • Need help with a SQL Query

    - by Jack
    I have created a table with the following structure- $sql = "CREATE TABLE followers ( uid int UNSIGNED NOT NULL UNIQUE, PRIMARY KEY(uid), follower_count int UNSIGNED , is_my_friend bool, status_count int UNSIGNED, location varchar(50) )"; I need to find the uid of the person with max(status_count+follower_count) and whose is_my_friend = 1 I wrote the following query but I ain't getting the correct uid. SELECT p.uid FROM (select uid,is_my_friend,max(follower_count+status_count) from followers) p WHERE p.is_my_friend = 1;

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  • Getting average from 3 columns in MS SQL

    - by barbarian
    I have table with 3 columns(smallint) in MS SQL 2005. Table Ratings ratin1 smallint, ratin2 smallint ratin3 smallint These columns can have values from 0 to 5 How to select average value of these fields, but only compare fields where value is greater then 0. So if column values are 1,3,5 - average had to be 3 if values are 0,3,5 - average had to be 4

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  • What is wrong with this sql statement?

    - by chandru_cp
    I am trying to fetch records based on two dates from sql server... Select * from table where CreatedDate between @StartDate and @EndDate and i pass 5/12/2010 and 5/12/2010 (ie) fetching records for today... I have 17 records dated 5/12/2010 but none seems to get selected.... EDIT: I use this but when i debug my value it shows 5/12/2010 12:00:00AM DateTime baseDate = DateTime.Today; var today = baseDate; GetBookingReportByDate(today,today);

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  • Problem using IIS 7 and SQL SERVER 2008

    - by Daniel
    I have problem using IIS 7 and SQL Server 2008. When I trying to show my website using IIS as webserver I get the message "[SqlException (0x80131904): Login failed for user..." When I using the webserver included in Visual Studio 2010 to show same website there is no problem to access the database. Why is it working with VS2010 webserver but not with IIS?

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  • How to filter a duration in SQL Profiler

    - by user341460
    Hi Friends, I need to run a profiler on SQL 2005 to capture the SPs with which took longer than 1/10th of a second. Can you please let me know how can I do that. I dont see the option. Also in the duration is that measured in second or minute. I would apprecaite your help. Thanks,

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  • SQL University: What and why of database testing

    - by Mladen Prajdic
    This is a post for a great idea called SQL University started by Jorge Segarra also famously known as SqlChicken on Twitter. It’s a collection of blog posts on different database related topics contributed by several smart people all over the world. So this week is mine and we’ll be talking about database testing and refactoring. In 3 posts we’ll cover: SQLU part 1 - What and why of database testing SQLU part 2 - What and why of database refactoring SQLU part 2 – Tools of the trade With that out of the way let us sharpen our pencils and get going. Why test a database The sad state of the industry today is that there is very little emphasis on testing in general. Test driven development is still a small niche of the programming world while refactoring is even smaller. The cause of this is the inability of developers to convince themselves and their managers that writing tests is beneficial. At the moment they are mostly viewed as waste of time. This is because the average person (let’s not fool ourselves, we’re all average) is unable to think about lower future costs in relation to little more current work. It’s orders of magnitude easier to know about the current costs in relation to current amount of work. That’s why programmers convince themselves testing is a waste of time. However we have to ask ourselves what tests are really about? Maybe finding bugs? No, not really. If we introduce bugs, we’re likely to write test around those bugs too. But yes we can find some bugs with tests. The main point of tests is to have reproducible repeatability in our systems. By having a code base largely covered by tests we can know with better certainty what a small code change can break in other parts of the system. By having repeatability we can make code changes with confidence, since we know we’ll see what breaks in other tests. And here comes the inability to estimate future costs. By spending just a few more hours writing those tests we’d know instantly what broke where. Imagine we fix a reported bug. We check-in the code, deploy it and the users are happy. Until we get a call 2 weeks later about a certain monthly process has stopped working. What we don’t know is that this process was developed by a long gone coworker and for some reason it relied on that same bug we’ve happily fixed. There’s no way we could’ve known that. We say OK and go in and fix the monthly process. But what we have no clue about is that there’s this ETL job that relied on data from that monthly process. Now that we’ve fixed the process it’s giving unexpected (yet correct since we fixed it) data to the ETL job. So we have to fix that too. But there’s this part of the app we coded that relies on data from that exact ETL job. And just like that we enter the “Loop of maintenance horror”. With the loop eventually comes blame. Here’s a nice tip for all developers and DBAs out there: If you make a mistake man up and admit to it. All of the above is valid for any kind of software development. Keeping this in mind the database is nothing other than just a part of the application. But a big part! One reason why testing a database is even more important than testing an application is that one database is usually accessed from multiple applications and processes. This makes it the central and vital part of the enterprise software infrastructure. Knowing all this can we really afford not to have tests? What to test in a database Now that we’ve decided we’ll dive into this testing thing we have to ask ourselves what needs to be tested? The short answer is: everything. The long answer is: read on! There are 2 main ways of doing tests: Black box and White box testing. Black box testing means we have no idea how the system internals are built and we only have access to it’s inputs and outputs. With it we test that the internal changes to the system haven’t caused the input/output behavior of the system to change. The most important thing to test here are the edge conditions. It’s where most programs break. Having good edge condition tests we can be more confident that the systems changes won’t break. White box testing has the full knowledge of the system internals. With it we test the internal system changes, different states of the application, etc… White and Black box tests should be complementary to each other as they are very much interconnected. Testing database routines includes testing stored procedures, views, user defined functions and anything you use to access the data with. Database routines are your input/output interface to the database system. They count as black box testing. We test then for 2 things: Data and schema. When testing schema we only care about the columns and the data types they’re returning. After all the schema is the contract to the out side systems. If it changes we usually have to change the applications accessing it. One helpful T-SQL command when doing schema tests is SET FMTONLY ON. It tells the SQL Server to return only empty results sets. This speeds up tests because it doesn’t return any data to the client. After we’ve validated the schema we have to test the returned data. There no other way to do this but to have expected data known before the tests executes and comparing that data to the database routine output. Testing Authentication and Authorization helps us validate who has access to the SQL Server box (Authentication) and who has access to certain database objects (Authorization). For desktop applications and windows authentication this works well. But the biggest problem here are web apps. They usually connect to the database as a single user. Please ensure that that user is not SA or an account with admin privileges. That is just bad. Load testing ensures us that our database can handle peak loads. One often overlooked tool for load testing is Microsoft’s OSTRESS tool. It’s part of RML utilities (x86, x64) for SQL Server and can help determine if our database server can handle loads like 100 simultaneous users each doing 10 requests per second. SQL Profiler can also help us here by looking at why certain queries are slow and what to do to fix them.   One particular problem to think about is how to begin testing existing databases. First thing we have to do is to get to know those databases. We can’t test something when we don’t know how it works. To do this we have to talk to the users of the applications accessing the database, run SQL Profiler to see what queries are being run, use existing documentation to decipher all the object relationships, etc… The way to approach this is to choose one part of the database (say a logical grouping of tables that go together) and filter our traces accordingly. Once we’ve done that we move on to the next grouping and so on until we’ve covered the whole database. Then we move on to the next one. Database Testing is a topic that we can spent many hours discussing but let this be a nice intro to the world of database testing. See you in the next post.

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  • SQL Server Installation - What is the Installation Media Folder..??

    - by Devashri
    I am installing SQL server 2008. I have installed .Net framewok 3.5. Then I got folder SQL Server 2008.Then I performed following steps- In that I clicked configuration Tools. Then I clicked SQL Server Installation Center. I clicked "Installation" hyperlink on left side. Then I clicked "New SQL server stand-alone installation or add features to an existing installation" Then i got a window "Browse for SQL server Installation Media" which folder should i choose..?? OR is there any other method to install SQL Server..??

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  • Can I connect to SQL Server using Windows Authentication from Java EE webapp?

    - by KG
    I am currently investigating how to make a connection to a SQL Server database from my Java EE web application using Windows Authentication instead of SQL Server authentication. I am running this app off of Tomcat 6.0, and am utilizing the Microsoft JDBC driver. My connection properties file looks as follows: dbDriver = com.microsoft.sqlserver.jdbc.SQLServerDriver dbUser = user dbPass = password dbServer = localhost:1433;databaseName=testDb dbUrl = jdbc:sqlserver://localhost:1433 I have zero problems with connecting to a SQL Server database in this fashion when using SQL Server authentication. Is there any way I can retrieve the credentials of the user's Windows Authentication and use that authentication for SQL Server? UPDATE: I know in ASP.net there is a way to set up Windows Authentication for access to the webapp, which is exactly what I am looking for, except I want to pass that token off to SQL Server for access to the database.

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  • Force.com presents Database.com SQL Azure/Amazon RDS unfazed

    - by Sarang
    At the DreamForce 2010 event in San Francisco Force.com unveiled their next big thing in the Fat SaaS portfolio "Database.com".  I am still wondering how would they would've shelled out for that domain name. Now why would a already established SaaS player foray into a key building block like Database? Potentially allowing enterprises to build apps that do not utilize the Force.com stack! One key reason is being seen as the Fat SaaS player with evey trick in the SaaS space under his belt. You want CRM come hither, want a custom development PaaS like solution welcome home (VMForce), want all your apps to talk to a cloud DB and minimize latency by having it reside closer to you cloud apps? You've come to the right place sire! Other is potentially killing foray of smaller DB players like Oracle (Not surprisingly, the Database.com offering is a highly customized and scalable Oracle database) from entering the lucrative SaaS db marketplace. The feature set promised looks great out of the box for someone who likes to visualize cool new architectures. The ground realities are certainly going to be a lot different considering the SOAP/REST style access patterns in lieu of the comfortable old shoe of SQL. Microsoft suffered heavily with SDS (SQL Data Services) offering in early 2009 and had to pull the plug on the product only to reintroduce as a simple SQL Server in the cloud, SQL Windows Azure. Though MSFT is playing cool by providing OData semantics to work with SQL Windows Azure satisfying atleast some needs of the Web-Style to a DB. The other features like Social data models including Profiles, Status updates, feeds seem interesting as well. (Although I beleive social is just one of the aspects of large scale collaborative computing). All these features start "Free" for devs its a good news but the good news stops here. The overall pricing model of $ per Users per Transactions / Month is highly disproportionate compared to Amazon RDS (Based on MySQL) or SQL Windows Azure (Based on MSSQL). Roger Jennigs of Oakleaf did an interesting comparo based on 3, 10, 100, 500 users and it turns out that Database.com going by current understanding is way too expensive for the services on offer. The offering may not impact the decision for DotNet shops mulling their cloud stategy or even some Java/MySQL shops thinking about Amazon RDS, however for enterprises having already invested in other force.com offerings this could be a very important piece in the cloud strategy jigsaw. One which would address a key cloud DB issue of "Latency" for them at least it will help having the DB in the neighborhood. The tooling and "SQL like" access provider drivers (Think ODBC/JDBC) will be available later this year. Progress Software has already announced their JDBC driver stack for Database.com. It remains to be seen how effective the overall solutions proves to be in the longer run but for starts its a important decision towards consolidating Force.com's already strong positioning in the SaaS space. As always contrasting views are welcome! :)

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